NCERT solution Class 12 electrochemistry

NCERT Solutions

Class 12 Chemistry

Electrochemistry

NCERT Questions

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Q.3

Depict the galvanic cell in which the reaction

Zn(s) +2Ag⁺ (aq) →Zn²⁺ (aq) +2Ag(s) take place. Further show:

(i) Which of the electrode is negatively charged?

(ii) The carriers of the current in the cell.

(iii) Individual reaction at each electrode.

The galvanic cell corresponding to the given redox reaction can be represented as:

Zn | Zn²⁺ (aq) || Ag⁺ (aq) | Ag

(i) Zn electrode is negatively charged because at this electrode, Zn oxidizes to Zn²⁺ and the leaving electrons accumulate on this electrode.

(ii) Ions are the carriers of current in the cell.

(iii) The reaction taking place at Zn electrode can be represented as:

Zn(s) à Zn²⁺ (aq) + 2e^-

And the reaction taking place at Ag electrode can be represented as:

Ag⁺ (aq) + e^- àAg(s)

(iv) In aqueous solutions, CuCl ₂ ionizes to give Cu²⁺ and Cl^– ions as:

CuCl₂(aq) à Cu²⁺ (aq) +2Cl^-(aq)

On electrolysis, either of Cu²⁺ ions or H₂O molecules can get reduced at the cathode. But the reduction potential of Cu ²⁺ is more than that of H ₂O molecules.

Cu²⁺ (aq) + 2e^-àCu (aq); E⁰= +0.34V

H₂O (l) +2e^- àH₂(g) +2OH^- ; E⁰=-0.83 V

Hence, Cu²⁺ ions are reduced at the cathode and get deposited.

Similarly, at the anode, either of Cl ^–or H₂O is oxidized. The oxidation potential of H₂O is higher than that of Cl^–.

2Cl^-(aq) à Cl₂(g) + 2e^-; E⁰= -1.36V

2H₂O (l) à O₂(g) +4H^- + 4e^-; E⁰=-1.23 V

But oxidation of H₂O molecules occurs at a lower electrode potential than that of Cl^– ions because of over-voltage (extra voltage required to liberate gas). As a result, Cl^– ions are oxidized at the anode to liberate Cl ₂ gas.

Video solution:

Electrochemistry Class 12 Chemistry NCERT Chapter 2 NCERT Solutions

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NCERT solutions of Electrochemistry Class 12 Chemistry - all questions of all exercises are solved. Q. No. 1, 2, 3, and so on. Complete explanation and detailed solution makes them the best videos for Class 12 Chemistry Electrochemistry NCERT solutions.